Edging attachment for drum sanding machines



H. L, "MYERS F June 13, 1933.

Filed July 11, 1952 4 Sheets-Sheet 1 r m n 8 m I H. L; MYERS 1,914,28Q

EDGING- ATTACHMENT FOR DRUM SANDING MACHINES June 13, 1933.

Filed July 11,, 1932 4 Sheets-Sheet 2 Invgnlor i B3 flllomey June 13, 1933- 1 MY I I 1,914,280

EDGING ATTACHMENT FOR DRUM SANDING MACHINES I Filed July 11, 19:52 4 Sheets-Sheet a I p wmmu /I Home y H. L. MYERS EDGING {ATTACHMENT FOR DRUM SANDING MACHINES Jqne 13, 1933.

Filea July 11, 1932 4 Sheets-Shegt 4 WNWWM Patented June 13, 1933 UNIT ED STATES PATENT: OFFICE HARRY L. MYERS, OF TOLEDO, OHIO, ASSIGNOR TO THE AMERICAN FLOOR SUB-FACING MACHINE COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO EDGING'ATTACHMENT FOR. DRUM SANDING MACHINES Application filed July 11,

J This invention relates to a novel rotary disc edging attachment for rotary drum sanding machines.

While the attachment is adaptable for use in connection with conventional marketed types of rotary drum sanding machines, it

- is particularly designed for use in conjunction with the well known American Universal drum sander, and especially for use as a supplement for the light weight surfacing machine, shown, described and claimed in my co-pending application identified as Serial No. 563,183, filed in the United States Patent Office under date of September 16,

The latter statement is made in view of the fact that the attachment herein illustrated is shown as applied to a light weight drum machine of the form shown in the I the specific construction and application of the edging attachment, said attachment being of a quick detachable type so that it may I "be employed as a supplement or accessory to the main machine, and being constructed with apower take-off pulley arranged to permit said pulley to be actuated from the existing type motor of said machine, whereby to promote simplicity and convenience and to materially add to the utility of said machine due to the fact that the attachment may be sold in conjunction therewith or separately therefrom to be applied to machines already in usewithout requiring alteration of theexisting or stock parts.

Another feature of the attachment is found to exist in the clever and skillfully designed adaptation fixture and the means 1932. Serial No. 621,968.

permitting the power propulsion or transmission unit of the attachment to be readily applied and removed. i

A further feature and advantage is predicated upon the incorporation in said attachment of a flexible drive shaft and an intimate- 1y associated flexible dust conveying hose, whereby to promote compactness and convenicenlce in the association and use of these de- A still further feature is found in the particular' construction of the abrading head of the rotary disc edging device, wherein the disc is properly housed in a dust collector unit and wherein means is provided to prevent the marginal edge of the disc from coming into contact with any adjacent right angularly disposed surface such as a wall, washboard, door frame and the like in order to avoid marring and defacing thereof.

Briefly stated, the principal novelty is predicated upon the provision of a surface conditioning machine primarily intended for treating the marginal edge portion of a floor or wall at its point bf juncture with a right angularly disposed wall or surface wherein the structure is characterized by a suitable portable body equipped with bearings, a

power shaft mounted for rotation in the bearlngs, a surfacing disc or equivalent element operatively connected with the shaft, and anti-friction means supported from the body, wherein said means is freely movable with respect to the disc and cooperates with the edge portion of the disc in a manner to permit the means to be forced or pressed firmly against an adjacent relatively stationary wall, such as a wash board or the like, to space the edge of the disc from the wall to eliminate defacing the wall and to facilitate stabilizing and expeditious handling of the.

disc while it is moved bodily over the surface being treated, such as for example the floor.

Referring now to the accompanying illustrative drawings, wherein like numerals are designate like parts throughout em 10 ed to p y will be observed the multiplicity of views, it that:

Figure 1 is an elevational view of the light weight sanding machine of the type constitutt p ing the subject matter of the aforesaid copending application, (Serial No. 563,183, September 16, 1931) showing the manner in which the novel rotary disc edging attachment is attached thereto for use.

Figure 2 is a top plan View on an enlarged scale with portions broken away and shown in section to disclose the means for taking care of the dust.

Figure 3 is a slightly enlarged sectional and elevational view showing essential parts of the adaptation fixture or plate and power transmission and attaching unit, the section being taken on the line 33 of Figure 1.

Figure 4 is a detail view of a coupling and stabilizing arm forming a part of said unit.

Figure 5 is a detail section on the line 55 of Figure 3.

Figure 6 is an elevational and sectional view of the adaptation plate or fixture.

Figure 7 is a perspective view of the couplingkey.

Figure 8 is a detail elevational view of the pulley equipped power transmission unit.

Figure 9 is a plan View of the rotary disc edger per se.

Figure 10 is a detail section taken approximately on the plane of the line 1010 of Figure 9.

Figure 11 is a detail view.

Figure 12 is a section taken approximately on the plane of the line 12-12 of Figure 1.

Referring now to the drawings, wherein the complete operative structure is illustrated, T deem it advisable to first explain a few of the essential features of the aforementioned light weight rotary drum surfacing machine shown in co-pending application Serial No. 563,183, filed September 16, 1931.

The machine comprises a portable frame which is approximately channel-shaped in cross section and here denoted by the numeral 13. Supported in appropriate bearings in the frontal portion of the frame is the horizontal rotary abrading drum 14. This is provided at one end with a pulley 15 to accommodate a detachable V-belt 16 which belt is trained over a complemental pulley 17 on the electric motor 18.

In using the edger attachment to be hereinafter detailed, the belt 16 is removed. Therefore the'drum 14 is not in use while the edger attachment is employed. Instead a somewhat shorter V-belt 19 is substituted for operating the attachment. v

i The motor also serves through the medium of a belt 20 to operate a pulley 21 (see Figure 2) which pulley drives a fan 22 in the fan housing 23 constituting a part of the dust collector. he dust collector also includes an appropriately shaped duct 24 leading from the drum to the fan housing and in, order to accommodate the attachment I add a supplemental duct or conduit 25. Therefore both ducts connect with the same fan housing and so that the ducts may be individually used I provide a two-way gate valve 26.

The duct 25 is somewhat in the nature of an elbow and projects through .the rear end of the frame of the machine to accommodate the attachment. Merely as a matter of com pleteness I call attention to Figure 1 showing the upstanding gooseneck pipe 27 forming a part of the dust collector system and carrying the accumulation bag 28. The numeral 29 merely designates the handle of the machine.

Referring now to the specific details of the attachment, T first call attention to the numeral 30 in Figure 6 which designates a fixture such as may be conveniently termed an adaptation bracket. This comprises an appropriately shaped plate 31 which is shaped to fit against one of the side walls of the machine frame as shown in Figure 1.

It is provided with bosses 32 apertured to accommodate retaining bolts in the manner shown. The plate is also formed with a marginal reinforcing flange 33 and reinforcing web 34 for a laterally and outwardly extending apertured bracket arm 35. Also forming an integral'part of this plate is a pr0tuberance 36 which is shown in Figure 3 and formed to provide a socket. In fact it is cast to form an annular shoulder 37 having a depression or notch 38 as shown in Figure 5 functioning as a keeper seat. Also along one side is a horizontal clearance groove 39 for the keeper pin 40 on the coupling key 41. The key is shaped as shown and provided with a handle 42.

The key and its retention spring 42 actually forms a part of the composite power transmission unit 43 shown in Figure 3. The unit embodies a shell 44 forming a bearing enclosure to accommodate the bearing for the rotary rigid shaft 45.

Forming an integral part of the shell is a stabilizing and coupling arm 46 terminating in a coupling eye 47 having a clearance groove 39a in registration with the complemental groove 39,. The socket 36 and eye 47 form the companion portions of a coupling to accommodate the rotary key and to provide means for quickly attaching this unit portion of the attachment to the frame 13.

The shaft 45 is provided with a pulley 48 to accommodate the previously mentioned belt 19. Likewise the shaft is operatively connected with the rotary flexible core 49 of the flexible shaft 50. The flexible shaft includes the usual rubber outer casing 51 and internal lining 52 and ferrule53 which is telescopically joined to an attaching neck 54 carried by the bearing enclosure 44.

As seen in Figure 8, the bearing enclosure 44 is provided with a depending screwthreaded retaining stud or bolt 55 whose lower threaded end is adapted to pass through the aperture 35a (see Figure 6) and bracket arm 35. The threaded end of the bolt obviously serves to accommodate re taining nuts as shown in Figure 1.

Moreover, in this arrangement I provide a cushioning and vibration shock absorblng coil spring 56 which surrounds the bolt .in the manner illustrated. This arrangement allows the bolt to be tightened to tension the spring in order to raise and lower the pulley 48 for tensioning the belt 19,

Attention is now invited to the particular construction of the rotary disc edger per se which may be unitarily referred to as an abrading head. As shown in Figures 9 and 10, this head 57 embodies a suitably shaped casting embodying a body portion 58 having bearings for the stub shaft 59 which drives the abrading disc 60 through the medium of a beveled gear 61.

Meshing with this gear is a companion gear 62 carried by thestub'shaft 63 mounted in bearings in the tubular extension 64. The aforesaid flexible shaft is operatively connected with the stub shaft 63. The numerals 65 and 66 designate main and supplemental handgrips arranged at right angles and in proper receptive position to facilitate handling of the head as a unit.

The numeral 67 designates a shield-like dust collector shell or unit which has its front edge cut off on an irregular line as indicated at 68 in Figure 9 to space it away from the wall, washboard, trim and the like. On one side this shield is offset to form a dust collecting nozzle or intake 68, said nozzle being completed by the presence ofthe depending skirt or flange 69. The dust conducting hose 70 is attached to this intake and superimposed on and attached to the flexible drive shaft and extends along said shaft to a point Within the vicinity of the machine where it is branched off as indicated at 71 in Figure 2 to permit it to beconnected to the .duct or elbow 25.

The numeral 72 in Figure 10 designates a rotary abutment or buffer in the'form of a flanged disc swivelly mounted on the shield portion of the unit 67 and of a diameter slightly greater than the disc 60. The purpose of this is to permit the flange to come into rotating or riding contact with the washboard as illustrated in Figure l in order to space the edge of the disc 60 therefrom to prevent defacing of the woodwork. In fact, this materially aids in permitting the head to be literally rolled along the washboard, the

thrust being absorbed by the freely swivellin g flanged buffer disc 72.

Obviously, one edge portion of the disc protrudes beyond the edge 68 of the dust unit as shown in Figure 9. Otherwise stated, the unit is cut away to expose the effective woodwork contacting surface of the swivel disc.

In practice, the adaptation fixture or plate into play for conditioning the edge port on of said floor.

.To bring the attachment in use, the valve 26 in Figure 2 is swung to the full line position shown in said figure, permitting the duct 25 to communicate with the fan housing 23. The hose end 71 is attached to said duct. The spring cushioned bolt or stud 55 issecured to the bracket arm 35. The arm 46 in Figure 3 is coupled through the medium of the key 41 to the socket or coupling element 36. In doing this, the keeper pin 40 is turned so that it'may be slipped through the grooves 39a and 39 respectively after which the key is turned to seat the pin 40 in the keeper seat 38. Thus in a sense the unit 43 is yieldably and adjustably bolted to the bracket arm 35 as well as coupled to the plate 31 in order to distribute the stress and strain and provide a rigid operating connection.

Obviously, the arm 46 and its associated details serve primarily as a stabilizing means to permit effective operation of the pulley 48. As before indicated, the pulley 48 is operated through the medium of a special short belt 19 which is placed over the motor pulley 17 after the drum belt 16 has been removed.

I wish to have it understood that although I have shown the attachment applied to a particular type of rotary drum machine, it is not restricted to this type. In fact, this same attachment is applicable to the American Universal machine and to other similar drum machines by providing slightcorrections in the mechanism.

'In conclusion I again wish to emphasize the arrangement particularly illustrated in Fig. 10 comprising a portable surfacing head including the rotary driven shaft 59, the surfacing element or disc 60 operatively head for independent rotation with respect to the surfacing element and constructed in such a manner as. to permit its peripheral edge, whether flanged or not, to cooperate with the marginal portions of the surfacing element 60 to serve as a thrust, anti-friction,"

and wall protection means.

I claim:

1., As a new product of manufacture, an abrading head for use in conjunction with an edger attachment of the class described comprising a casting including a body having bearings and a lateral extension having bearings, a stub shaft mounted in said first named bearings, an abrading disc connected to said stub shaft, a second stub shaft mounted in the remaining bearings in said extension, gearing connecting said shafts together for operation in unison, a pair of upper and lower handles secured to said casting, a flanged dust unit connected to the lower end portion of the casting and partially embracing said disc, the frontal edge portion of said unit being cut away and without a' flange, and one edge portion of said unit being offset with respect to the adjacent edge portion of the casing to provide a tapered dust intake, and a dust collecting hose connected with said intake, together with a rotary flanged disc swivelly mounted on said guard and interposed between the guard and abrading disc, said flanged disc being of a diameter greater than the abrading disc to permit-the flanged edge thereof to protrude beyond the marginal edge of the disc to provide a rotary buffer to prevent the abrading disc from striking adjacent'woodwork.

2. An edging attachment for a rotary drum sander of the class described comprising an adaptation plate adapted to be bolted to the sander machine frame, said plate being provided with a laterally projecting apertured bracket arm, a flexible shaft, an abrading head at the outer end of the shaft, a driving unit at the inner end of the shaft, sald unit being provided with a pulley, and a retaining bolt adapted to be detachably connected with said bracket arm, a cushioning spring surrounding the bolt and co-operable with said arm, a stabilizing and connecting arm, and means for detachably coupling said arm to the plate.

3. An edging attachment of the class described comprising an adapter plate designed for detachable connection with a portable frame, said plate having a tubular protuberance defining a coupling socket, said socket having a clearance groove and a keeper seat, an arm formed integrally with said plate and apertured at its outer end, a flexible drive shaft, an abrading head operatively connected with the outer end thereof, a driving unit attached to the inner end thereof, said unit including a pulley equipped rigid shaft, a bearing enclosure for said shaft a lateral brace arm connected with said enclosure and terminating in a grooved eye adapted to be alined with said socket, a spring-pressed key mounted for rotation in said eye, said key having a keeper pin at its inner end adapted to be passed through the grooves and seated in said keeper seat, said unit also including a spring equipped attaching bolt adapted to be detachably connected to the apertured end of said brace arm.

4. A structure of the class described comprising a portable surfacing head including a rotary driven shaft, a surfacing element operatively connected with said shaft, a dust colsaid shaft, and anti-friction lector unit partially surrounding said element, and abufi'er mounted on said head for independent rotation with respect to said surfacing element, said buffer being of a proportion to permit its peripheral edge to project beyond the marginal portions of the surfacing element.

5. A machine of the class described comprising an abrading head embodying a power driven shaft, a rotary abrading disc carried by said shaft, a disc-like buffer plate mounted for rotation on the head and disposed above said disc and having a depending marginal flange, said buffer being of a diameter greater than-the abrading disc with the flange projecting beyond the marginal edge of the abrading disc in order to movably contact the woodwork.

6. A surface edging device comprising a body having bearings, a power shaft mounted for rotation in the bearings, a surfacing disc ope-ratively connected with said shaft, and anti-friction means supported from said body, said means being freely movable with respect to said disc and co-operating with the edge portion of the disc in a manner to permit said means to be pressed firmly against an adjacent wall in a manner to space the edge of the disc from said wall to eliminate defacing and to facilitate stabilizing and expeditious handling of the disc while it is moved bodily over the surface being treated.

7. A. surface edging device comprising a body having bearings, a power shaft mounted for rotation in the bearings, a surface conditioning disc operatively connected with means supported from said body, said means being arranged with respect to the disc and having its outer marginal portion relatively and freely movable with respect to the edge portion of the disc in a manner to permit said means to be pressed and held firmly against an adjacent right angularly disposed surface while the disc is held against the surface being treated, whereby to space the edge of the disc from the first-named surface and to facilitate stabilizing and expeditious handling of the disc while it is moved longitudinally of the latter surface and held firmly downagainst the second-mentioned surface.

8. As a new product of manufacture, an edging attachment comprising a body having bearings, a shaft mounted for rotation in said bearings, a surfacing disc operatively connected to said shaft, a pair of upper and lower handles rigidly secured to said body in I and interposed between the latter and sur-. facing disc and parallel to the central horizontal portion of the unit and disc, said abutment being of a diameter greater than the abrading disc with the flange protruding beyond the marginal edge of the disc for the purposes described.

In testimony whereof I aflix my si ature. HARRY L. M ERS. 

